What is tube length of telescope ?

What is tube lenght of compound microscope ?

...... is optical length of telescope.

The diameter of the moon is 3.5 xx 10^(3) km and its distance from the earth is 3.8 xx 10^(5)km . It is seen through a telescope having focal lengths of objective and eye-piece as 4m and 10 cm respectively. Calculate (a) magnifying power of telescope (b) length of telescope tube and (c) anngular size of image of moon.

Where is the largest telescope in India ? What is diameter of objective in it?

An open glass tube is immersed in mercury in such a way that a length of 8 cm extends above the mercury level. The open end of the tube is then closed and sealed and the tube is raised vertically up by additional 46 cm. what will be length of the air column above mercury in the above now ? (Atmospheric pressure = 76 cm of Hg)

What is the focal length of plain goggles ?

What is telescope ? Discuss the types of telescopes that are used in general.

A Galilean telescope of 10 -fold magnification has the length of 45 cm when adjusted to infinity. Determine : (a) the focal lengths of the telescope's objective and ocular, (b) by what distance the ocualr should be displaced to adjust the telescope to the distance of 50 m.

What are reflecting type of telescope ? Explain the advantages and disadvantages of reflecting telescopes as compared to refracting telescope and also give the solution.